名称:
Dynamic redox systems based on bis(spiroxanthene)-type donors with a polycyclic aromatic hydrocarbon: preparation, X-ray structures, and electrochromic response with fluorescence change
摘要:
The long C-C bonds (1.614(2)-1.630(2) Angstrom) in newly prepared title donors 2-6 are cleaved upon two-electron oxidation to afford the bond-dissociated dicationic dyes 2(2+)-6(2+), whose electron affinities are stronger than the corresponding biphenyl-2,2'-diyl dications 1(2+) due to the spatial proximity of two xanthenylium units. Not only UV-vis but also fluorescence spectra changed drastically upon electrolysis since only colorless neutral donors are fluorescent. (C) 2004 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.tetlet.2004.09.080